<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>houdunren.com</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }

        body {
            background: #2c3e50;
            width: 100vw;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        main {
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: linear-gradient(to right, #f1c40f, #e67e22, #e74c3c);
            position: relative;
            z-index: -2;
        }

        main::after {
            content: '';
            position: absolute;
            width: 90%;
            height: 90%;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            border-radius: 50%;
            background: #2c3e50;
            z-index: -1;
        }

        .line {
            position: absolute;
            width: 80%;
            height: 80%;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            border-radius: 50%;
            /* background: #000; */
        }

        .line>div {
            width: 8px;
            background: #fff;
            height: 100%;
            position: absolute;
            left: 50%;
        }

        .line>div:nth-of-type(1) {
            transform: rotate(0deg);
        }

        .line>div:nth-of-type(2) {
            transform: rotate(30deg);
        }

        .line>div:nth-of-type(3) {
            transform: rotate(60deg);
        }

        .line>div:nth-of-type(4) {
            transform: rotate(90deg);
        }

        .line>div:nth-of-type(5) {
            transform: rotate(120deg);
        }

        .line>div:nth-of-type(6) {
            transform: rotate(150deg);
        }
    </style>
</head>

<body>
    <main>
        <div class="line">
            <div></div>
            <div></div>
            <div></div>
            <div></div>
            <div></div>
            <div></div>
        </div>
    </main>
</body>

</html>